Portable lock-stitch sewing-machine.



H. WESTCOTT & Afl. TETLEY. PORTABLE LOCK STITCH SEWING MACHINE.

APPLICATION 'man JAN.21.1915.

1,205 .m Patented 001;. 10, 1916. l'

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H. WESTCOTT & A. 1. TETLETY.

PORTABLE LOCK STITCH SEWING MACHINE. APPLlcATIoN FILED JAN.2I. T915. 1,209,75. Patent@ 00t.10,1916.

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Arthur' l TetZety,

l Kin HERBERT wnsrcozrr, or sourir HAMPSTEAD, LONDON, AND ARTHUR Josnua ra'rnnr,

or BEDFORD, ENGLAND.

PORTABLE LOCK-STITCH SEWING-MACHINE.

Leaders.

Specification of Letters Patent.

Patented Oct. i0, 19h/i.

Application led January 21, 1915. Serial No. 3,582.

To all whom z't may concern -Be it known that we, HERBERT Wns'roor'r and ARTHUR JOSHUA TETLEY, subjects of the of Great Britain and Ireland, residing, resp ctively, at 2l Adelaide road, South Hampstead, London, N. W., England, and Hilbre (Strange, Bedford, in the county of Bedfordshire, England, have invented 'new and useful Improvements inv Portable Lock- Stitch Sewing-Machines, of which the following is a specification.

This invention relates to a portable lock stitch sewing machine and consists of the formation and combination of parts to make the machine hereinafter described a lock stitch sewing machine, cheap in construction and portable.

In order that this invention may be the better understood drawings are shown herewith of a machine built in accordance with this invention.

Figure l is an elevation of the machine. Fig. 2 is a plan on the line 2-2 of Fig. l withthe working table removed. `Fig. 3 is an end elevation on the line 3-3 of Fig. l the gear wheels being removed. Fig. 4 is an end elevation of the details of the under feed mechanism.

A general metal frame a is-made in the shape of the letter G with the usual hand wheel' on a, shaft geared into a top driving shaft c so as to produce the operation of the needle d there being a metal work table e above the under side f of the frame. Upon this under side f is provided a screwed stud g forming the fulcrum of an under lever It. This under lever is rocked horizontally by another back leve;` s which has a fulcrum at j and is operated by the cam. 7c upon the upper driving shaftc which works in a fork '11 at the upper end of the back lever The farther end la of the under lever z, engages by a slot'gearing onto a pin with the framework or shuttle-carriage Z, carrying a shuttle m having the under thread, and moves'this frameworkor shuttle carriage Z backward and forward in a straight line upon a fixed pin Z at right angles to the line of the upper driving. shaft c.

The movement of thecloth through the machine is effected by an under feed a pressing upward against a presser foot 0 operated downward by a spring o in the needle bar holder p The;

the pawl t and ratchet ramework or shuttle carriage Z holdto make engagef ment with projections on other parts. Further this arrangement is not noisy at high velocities. Upon this pin orscrew g is a lever r that oscillates a disk r backward and .forward upon a fulcrurnA s. Upon this fulcrum s and loosely fitting thereon is fitted a triangular piece s which has attached to it a three tooth ratchet t operated by aI spring pressed pawl t fitted to the disk r' so that as the disk r rotates, the triangular piece s by t also rotates, so as to lift up the under feed upon' the presser foot o.V There is also a cam face u fitted tothe disk r so that when the under feed n, is lifted up it is thrust forward by the downward projection n fixed to the feed n against thespring 'w to effect the feed. Vhen the cam face u has passed from the projection n the feed n isbrought back by the spring w until its end strikes against the end of set screw fw which determines the length of the feed.

To give the proper amount of slackness to the upper thread, so that it may extend to allow the shuttle to pass through its bight, the upper thread passes through the eye of a take up lever.

The usual top bobbin with thread adjustment to the needle, the means for operating the needle, and the usual shuttle bobbin Winder .e are provided in this machine.

W' e claim A lock stitch sewing machine comprising a driving shaft, a frame, a shuttle frame work carrying the shuttle and under thread adapted to have'la straight reciprocating motion, a bar at right angles to the line of the driving shaft adapted to carry the said shuttle framework, a horizontally reciproeating under lever adapted to have motion in one plane only and operate the said shuttle framework, a back lever rocking in a vertical plane about a fixed axis adapted to operate said under lever, a cam mounted on the driving shaft and adapted to operate said back lover, a disk pivoted upon a pin and rocked by a lever connected to the shuttlc framework, a triangular piece pivoted upon tho same pin as the said disk, a threen, to press upward Y tooth ratchet wheel firmly affixed tothe said will operate with a forward motion, when triangular piece a spring pressed ratchet in the raised position and a backward mo# pawl pivoted on the said disk, and adapted tion when in the lowered position." 15 to engage said ratchet wheel so that when In testimony whereof we have signed our the'said disk is rocked the said triangular names to this specification in the presence of I piece being to produce an under feed which piece is turned in'one direction only so as to two subscribing witnesses. press up the under 'feed at each alternate HERBERT'WESTCOTT. stroke of the said disk and a cam piece upon the said disk, adapted to move the said un- ARTHUR JOSHUA TETLEY' der feed longitudinally, the combined effect Witnesses:

of the said triangular piece and the said cam WALTER CARVER,

lt. WEs'rAooT'r. 

